Automatically fix mount on systemd unit failure due to bad mount

For quite some time, I've been fighting a problem with my Raspberry Pi having difficulty to maintain a connection to my external HDD. Sometimes it just randomly throws I/O error, and when that happens, my rtorrent service unit fails with it. Now I tried many things, this is the solution that I have now: [Unit] Description=rTorrent After=network.target [Service] User=root Type=forking KillMode=none ExecStartPre=/home/pi/mount_media.sh ExecStart=/usr/bin/screen -d -m -fa -S rtorrent /usr/bin/rtorrent ExecStop=/usr/bin/killall -w -s 2 /usr/bin/rtorrent WorkingDirectory=/home/pi Restart=on-failure [Install] WantedBy=default.target Where mount_media.sh simply remounts the directory. Stuff I also tried but didn't work: - OnFailure start different unit which remounts the directory - Start the unit with a script, which remounts the drive and then starts rtorrent Right now, this approach has left me with "cannot access 'Media': Transport endpoint is not connected" Forgot to add: /media/Media is my mount point So how should I take care of a moot point randomly disconnecting?